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windows boot option is suddenly missing

Hi, two or three ago suddenly the boot option for Windows has disappeared. It is an Imac 27 inch, late 2013 model on OS X Yosemite 10.10.3 (14D136)

No i can only start OSX and it seems that windows was never there? How can i restore this? I normaly press ALT and then two boot options show up, recently only OSX. I did not changed anything. What i did see in the deleted items is a couple of files since the last days, maybe this is related?

Modelnaam: iMac

Modelaanduiding: iMac14,2

Processornaam: Intel Core i7

Processorsnelheid: 3,5 GHz

Aantal processors: 1

Totale aantal cores: 4

L2-cache (per core): 256 KB

L3-cache: 8 MB

Geheugen: 16 GB

Opstart-ROM-versie: IM142.0118.B09

SMC-versie (systeem): 2.15f7

iMac, OS X Yosemite (10.10.3)

Posted on Jun 30, 2015 3:06 PM

Best reply

Loner T

Level 9

59,471 points

Posted on Jun 30, 2015 4:13 PM

Was the Yosemite Recovery Update applied to your iMac?

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146 replies

Loner T

Level 9

59,471 points

Jul 10, 2015 7:18 AM in response to tomfromvleuten

The procedure is as follows.

1. Merge disk1s2 and disks3 - diskutil mergePartitions JHFS+ disk1s2 disk1s3. You will lose Recovery HD. Please post the output of sudo fdisk /dev/disk1 after this step to verify that MBR is intact.

2. Reboot and test OSX and Windows.

3. Create a Fusion drive using disk0s2 and disk1s2 (disk1s3 has been deleted in step 1).

a. diskutil cs create OSX-MacintoshLVG disk0s2 disk1s2 (the order is important and the SSD should be first. This creates a LV Group).

b. diskutil cs createVolume OSX-MacintoshLVG jhfs+ "Macintosh HD" 100% (this creates a new LV using 100% disk space from disk0s2 and disk1s2).

c. Restore from TM Backup to Macintosh HD. Please make sure you use Macintosh HD as the destination.

d. Post the output of sudo fdisk /dev/disk1 and test OSX and Windows.

4. Backup OSX and Windows as a new baseline.

Jul 10, 2015 11:41 AM in response to Loner T

i dont think it worked??? did it?

Loner T

Level 9

59,471 points

Jul 10, 2015 11:52 AM in response to tomfromvleuten

I always invariable forget the name when merging. 😟.

Please use the following command...

diskutil mergePartitions JHFS+ "Macintosh HD" disk1s2 disk1s3

Jul 10, 2015 12:30 PM in response to Loner T

Loner T

Level 9

59,471 points

Jul 10, 2015 12:34 PM in response to tomfromvleuten

This looks fine. Please test OSX and Windows booting and switching.

Jul 10, 2015 12:39 PM in response to Loner T

works perfectly :-)

Jul 10, 2015 12:40 PM in response to tomfromvleuten

can i make the next steps? step 3?

Loner T

Level 9

59,471 points

Jul 10, 2015 12:50 PM in response to tomfromvleuten

Yes, please. You will lose OSX completely, so you should boot from the external boot for step 3.

diskutil cs create

Usage: diskutil coreStorage create lvgName

MountPoint|DiskIdentifier|DeviceNode ...

Create a CoreStorage logical volume group from one or more disks.

The specified disks will become the initial set of PVs.

All existing data on the drive will be lost.

Ownership of the affected disk is required.

Example: diskutil coreStorage create MyLVG disk1

diskutil cs createvolume

Usage: diskutil coreStorage createVolume lvgUUID|lvgName type name size

[-stdinpassphrase | -passphrase [passphrase]]

Add a new logical volume to a CoreStorage logical volume group.

Type is the file system to initialize on the new logical volume. Valid types

are Journaled HFS+ or Case-sensitive Journaled HFS+ or their aliases.

Size is the amount of space to allocate from the parent logical volume group.

Valid sizes are floating-point numbers with a suffix of B(ytes), S(512-byte-

blocks), K(ilobytes), M(egabytes), G(igabytes), T(erabytes), P(etabytes),

or (%) a percentage of the current size of the logical volume group.

Example: diskutil coreStorage createVolume

11111111-2222-3333-4444-555555555555 jhfs+ myLV 10g

Jul 10, 2015 12:50 PM in response to Loner T

error?

Loner T

Level 9

59,471 points

Jul 10, 2015 1:02 PM in response to tomfromvleuten

Did you boot from the external OSX Boot device? Your disk1s2 is your internal OSX boot and needs to be erased.

Jul 10, 2015 1:13 PM in response to Loner T

no i did not boot from the internal drive? It is not even in..... ?

Loner T

Level 9

59,471 points

Jul 10, 2015 1:17 PM in response to tomfromvleuten

Are you able to boot into Internet Recovery Console (Command+Opt+R - with the spinning globe) and disconnect any external storage. Use Utilities -> Terminal. You already have a CS volume now. You will just need to add disk1s2 to the fusion drive.

You can post the output of diskutil cs list to confirm.

Jul 10, 2015 1:35 PM in response to Loner T

in disk utility i see

121.33 GB APPLE SSD S.

- untitled

1 TB APPLE HDD ST1000....

- MAcintosh HD

- BOOTCAMP

------------------------------------------

(the globe) disk 2

- OS X Base System

i can unmount

untitled

Macintosh

Bootcamp

Thats

Loner T

Level 9

59,471 points

Jul 10, 2015 1:45 PM in response to tomfromvleuten

Can you run the commands in step 3?

Jul 10, 2015 2:05 PM in response to Loner T

TThe first command was succesfull. Finished corestorage operation.

THe second command not.

right after de command iT says

usage: diskutil CCS createvolume lvgUUID lvgNAME type name size

|- stdinpassphrase. | - passphrase. [passphrase]]

ad a new logical volume to a corestorage logical volume group

type is the file System to initialize on the new logical volume. Valid types are journaled. HFS+ OR their aliases

size is the amount of space to allocate from the parent logical volume groep.

ETc etc

DO you know enough?

windows boot option is suddenly missing